1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * LCD driver for HP Jornada 700 series (710/720/728)
5 * Copyright (C) 2006-2009 Kristoffer Ericson <kristoffer.ericson@gmail.com>
6 */
7
8#include <linux/device.h>
9#include <linux/fb.h>
10#include <linux/kernel.h>
11#include <linux/lcd.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/delay.h>
15
16#include <mach/jornada720.h>
17#include <mach/hardware.h>
18
19#include <video/s1d13xxxfb.h>
20
21#define LCD_MAX_CONTRAST	0xff
22#define LCD_DEF_CONTRAST	0x80
23
24static int jornada_lcd_get_power(struct lcd_device *ld)
25{
26	return PPSR & PPC_LDD2 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
27}
28
29static int jornada_lcd_get_contrast(struct lcd_device *ld)
30{
31	int ret;
32
33	if (jornada_lcd_get_power(ld) != FB_BLANK_UNBLANK)
34		return 0;
35
36	jornada_ssp_start();
37
38	if (jornada_ssp_byte(GETCONTRAST) == TXDUMMY) {
39		ret = jornada_ssp_byte(TXDUMMY);
40		goto success;
41	}
42
43	dev_err(&ld->dev, "failed to set contrast\n");
44	ret = -ETIMEDOUT;
45
46success:
47	jornada_ssp_end();
48	return ret;
49}
50
51static int jornada_lcd_set_contrast(struct lcd_device *ld, int value)
52{
53	int ret = 0;
54
55	jornada_ssp_start();
56
57	/* start by sending our set contrast cmd to mcu */
58	if (jornada_ssp_byte(SETCONTRAST) == TXDUMMY) {
59		/* if successful push the new value */
60		if (jornada_ssp_byte(value) == TXDUMMY)
61			goto success;
62	}
63
64	dev_err(&ld->dev, "failed to set contrast\n");
65	ret = -ETIMEDOUT;
66
67success:
68	jornada_ssp_end();
69	return ret;
70}
71
72static int jornada_lcd_set_power(struct lcd_device *ld, int power)
73{
74	if (power != FB_BLANK_UNBLANK) {
75		PPSR &= ~PPC_LDD2;
76		PPDR |= PPC_LDD2;
77	} else {
78		PPSR |= PPC_LDD2;
79	}
80
81	return 0;
82}
83
84static struct lcd_ops jornada_lcd_props = {
85	.get_contrast = jornada_lcd_get_contrast,
86	.set_contrast = jornada_lcd_set_contrast,
87	.get_power = jornada_lcd_get_power,
88	.set_power = jornada_lcd_set_power,
89};
90
91static int jornada_lcd_probe(struct platform_device *pdev)
92{
93	struct lcd_device *lcd_device;
94	int ret;
95
96	lcd_device = devm_lcd_device_register(&pdev->dev, S1D_DEVICENAME,
97					&pdev->dev, NULL, &jornada_lcd_props);
98
99	if (IS_ERR(lcd_device)) {
100		ret = PTR_ERR(lcd_device);
101		dev_err(&pdev->dev, "failed to register device\n");
102		return ret;
103	}
104
105	platform_set_drvdata(pdev, lcd_device);
106
107	/* lets set our default values */
108	jornada_lcd_set_contrast(lcd_device, LCD_DEF_CONTRAST);
109	jornada_lcd_set_power(lcd_device, FB_BLANK_UNBLANK);
110	/* give it some time to startup */
111	msleep(100);
112
113	return 0;
114}
115
116static struct platform_driver jornada_lcd_driver = {
117	.probe	= jornada_lcd_probe,
118	.driver	= {
119		.name	= "jornada_lcd",
120	},
121};
122
123module_platform_driver(jornada_lcd_driver);
124
125MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
126MODULE_DESCRIPTION("HP Jornada 710/720/728 LCD driver");
127MODULE_LICENSE("GPL");
128